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d02b48c6 | 1 | /* ssl/s3_pkt.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
3 | * All rights reserved. |
4 | * | |
5 | * This package is an SSL implementation written | |
6 | * by Eric Young (eay@cryptsoft.com). | |
7 | * The implementation was written so as to conform with Netscapes SSL. | |
8 | * | |
9 | * This library is free for commercial and non-commercial use as long as | |
10 | * the following conditions are aheared to. The following conditions | |
11 | * apply to all code found in this distribution, be it the RC4, RSA, | |
12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
13 | * included with this distribution is covered by the same copyright terms | |
14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
15 | * | |
16 | * Copyright remains Eric Young's, and as such any Copyright notices in | |
17 | * the code are not to be removed. | |
18 | * If this package is used in a product, Eric Young should be given attribution | |
19 | * as the author of the parts of the library used. | |
20 | * This can be in the form of a textual message at program startup or | |
21 | * in documentation (online or textual) provided with the package. | |
22 | * | |
23 | * Redistribution and use in source and binary forms, with or without | |
24 | * modification, are permitted provided that the following conditions | |
25 | * are met: | |
26 | * 1. Redistributions of source code must retain the copyright | |
27 | * notice, this list of conditions and the following disclaimer. | |
28 | * 2. Redistributions in binary form must reproduce the above copyright | |
29 | * notice, this list of conditions and the following disclaimer in the | |
30 | * documentation and/or other materials provided with the distribution. | |
31 | * 3. All advertising materials mentioning features or use of this software | |
32 | * must display the following acknowledgement: | |
33 | * "This product includes cryptographic software written by | |
34 | * Eric Young (eay@cryptsoft.com)" | |
35 | * The word 'cryptographic' can be left out if the rouines from the library | |
36 | * being used are not cryptographic related :-). | |
37 | * 4. If you include any Windows specific code (or a derivative thereof) from | |
38 | * the apps directory (application code) you must include an acknowledgement: | |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
40 | * | |
41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
51 | * SUCH DAMAGE. | |
52 | * | |
53 | * The licence and distribution terms for any publically available version or | |
54 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
55 | * copied and put under another distribution licence | |
56 | * [including the GNU Public Licence.] | |
57 | */ | |
c51ae173 | 58 | /* ==================================================================== |
82b0bf0b | 59 | * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved. |
c51ae173 BM |
60 | * |
61 | * Redistribution and use in source and binary forms, with or without | |
62 | * modification, are permitted provided that the following conditions | |
63 | * are met: | |
64 | * | |
65 | * 1. Redistributions of source code must retain the above copyright | |
66 | * notice, this list of conditions and the following disclaimer. | |
67 | * | |
68 | * 2. Redistributions in binary form must reproduce the above copyright | |
69 | * notice, this list of conditions and the following disclaimer in | |
70 | * the documentation and/or other materials provided with the | |
71 | * distribution. | |
72 | * | |
73 | * 3. All advertising materials mentioning features or use of this | |
74 | * software must display the following acknowledgment: | |
75 | * "This product includes software developed by the OpenSSL Project | |
76 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
77 | * | |
78 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
79 | * endorse or promote products derived from this software without | |
80 | * prior written permission. For written permission, please contact | |
81 | * openssl-core@openssl.org. | |
82 | * | |
83 | * 5. Products derived from this software may not be called "OpenSSL" | |
84 | * nor may "OpenSSL" appear in their names without prior written | |
85 | * permission of the OpenSSL Project. | |
86 | * | |
87 | * 6. Redistributions of any form whatsoever must retain the following | |
88 | * acknowledgment: | |
89 | * "This product includes software developed by the OpenSSL Project | |
90 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
91 | * | |
92 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
93 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
94 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
95 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
96 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
97 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
98 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
99 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
100 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
101 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
102 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
103 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
104 | * ==================================================================== | |
105 | * | |
106 | * This product includes cryptographic software written by Eric Young | |
107 | * (eay@cryptsoft.com). This product includes software written by Tim | |
108 | * Hudson (tjh@cryptsoft.com). | |
109 | * | |
110 | */ | |
d02b48c6 RE |
111 | |
112 | #include <stdio.h> | |
113 | #include <errno.h> | |
114 | #define USE_SOCKETS | |
7b63c0fa | 115 | #include "ssl_locl.h" |
ec577822 BM |
116 | #include <openssl/evp.h> |
117 | #include <openssl/buffer.h> | |
d02b48c6 | 118 | |
61f5b6f3 | 119 | static int do_ssl3_write(SSL *s, int type, const unsigned char *buf, |
82b0bf0b | 120 | unsigned int len, int create_empty_fragment); |
d02b48c6 | 121 | static int ssl3_get_record(SSL *s); |
c51ae173 | 122 | |
36d16f8e | 123 | int ssl3_read_n(SSL *s, int n, int max, int extend) |
d02b48c6 | 124 | { |
c51ae173 BM |
125 | /* If extend == 0, obtain new n-byte packet; if extend == 1, increase |
126 | * packet by another n bytes. | |
127 | * The packet will be in the sub-array of s->s3->rbuf.buf specified | |
128 | * by s->packet and s->packet_length. | |
129 | * (If s->read_ahead is set, 'max' bytes may be stored in rbuf | |
130 | * [plus s->packet_length bytes if extend == 1].) | |
131 | */ | |
d02b48c6 RE |
132 | int i,off,newb; |
133 | ||
c51ae173 BM |
134 | if (!extend) |
135 | { | |
136 | /* start with empty packet ... */ | |
137 | if (s->s3->rbuf.left == 0) | |
138 | s->s3->rbuf.offset = 0; | |
139 | s->packet = s->s3->rbuf.buf + s->s3->rbuf.offset; | |
140 | s->packet_length = 0; | |
141 | /* ... now we can act as if 'extend' was set */ | |
142 | } | |
143 | ||
36d16f8e BL |
144 | /* extend reads should not span multiple packets for DTLS */ |
145 | if ( SSL_version(s) == DTLS1_VERSION && | |
146 | extend) | |
147 | { | |
148 | if ( s->s3->rbuf.left > 0 && n > s->s3->rbuf.left) | |
149 | n = s->s3->rbuf.left; | |
150 | } | |
151 | ||
c51ae173 | 152 | /* if there is enough in the buffer from a previous read, take some */ |
d02b48c6 RE |
153 | if (s->s3->rbuf.left >= (int)n) |
154 | { | |
c51ae173 | 155 | s->packet_length+=n; |
d02b48c6 RE |
156 | s->s3->rbuf.left-=n; |
157 | s->s3->rbuf.offset+=n; | |
158 | return(n); | |
159 | } | |
160 | ||
161 | /* else we need to read more data */ | |
c51ae173 BM |
162 | if (!s->read_ahead) |
163 | max=n; | |
d02b48c6 | 164 | |
c51ae173 BM |
165 | { |
166 | /* avoid buffer overflow */ | |
82b0bf0b | 167 | int max_max = s->s3->rbuf.len - s->packet_length; |
c51ae173 BM |
168 | if (max > max_max) |
169 | max = max_max; | |
170 | } | |
cc96f6b7 BM |
171 | if (n > max) /* does not happen */ |
172 | { | |
5277d7cb | 173 | SSLerr(SSL_F_SSL3_READ_N,ERR_R_INTERNAL_ERROR); |
cc96f6b7 BM |
174 | return -1; |
175 | } | |
d02b48c6 | 176 | |
c51ae173 BM |
177 | off = s->packet_length; |
178 | newb = s->s3->rbuf.left; | |
179 | /* Move any available bytes to front of buffer: | |
180 | * 'off' bytes already pointed to by 'packet', | |
181 | * 'newb' extra ones at the end */ | |
182 | if (s->packet != s->s3->rbuf.buf) | |
183 | { | |
184 | /* off > 0 */ | |
185 | memmove(s->s3->rbuf.buf, s->packet, off+newb); | |
186 | s->packet = s->s3->rbuf.buf; | |
187 | } | |
b35e9050 | 188 | |
d02b48c6 RE |
189 | while (newb < n) |
190 | { | |
c51ae173 BM |
191 | /* Now we have off+newb bytes at the front of s->s3->rbuf.buf and need |
192 | * to read in more until we have off+n (up to off+max if possible) */ | |
193 | ||
58964a49 | 194 | clear_sys_error(); |
d02b48c6 RE |
195 | if (s->rbio != NULL) |
196 | { | |
197 | s->rwstate=SSL_READING; | |
c51ae173 | 198 | i=BIO_read(s->rbio, &(s->s3->rbuf.buf[off+newb]), max-newb); |
d02b48c6 RE |
199 | } |
200 | else | |
201 | { | |
202 | SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET); | |
c51ae173 | 203 | i = -1; |
d02b48c6 RE |
204 | } |
205 | ||
206 | if (i <= 0) | |
207 | { | |
c51ae173 | 208 | s->s3->rbuf.left = newb; |
d02b48c6 RE |
209 | return(i); |
210 | } | |
211 | newb+=i; | |
212 | } | |
213 | ||
c51ae173 BM |
214 | /* done reading, now the book-keeping */ |
215 | s->s3->rbuf.offset = off + n; | |
216 | s->s3->rbuf.left = newb - n; | |
217 | s->packet_length += n; | |
e1798f85 | 218 | s->rwstate=SSL_NOTHING; |
d02b48c6 RE |
219 | return(n); |
220 | } | |
221 | ||
222 | /* Call this to get a new input record. | |
223 | * It will return <= 0 if more data is needed, normally due to an error | |
224 | * or non-blocking IO. | |
225 | * When it finishes, one packet has been decoded and can be found in | |
c51ae173 BM |
226 | * ssl->s3->rrec.type - is the type of record |
227 | * ssl->s3->rrec.data, - data | |
d02b48c6 RE |
228 | * ssl->s3->rrec.length, - number of bytes |
229 | */ | |
b35e9050 | 230 | /* used only by ssl3_read_bytes */ |
6b691a5c | 231 | static int ssl3_get_record(SSL *s) |
d02b48c6 RE |
232 | { |
233 | int ssl_major,ssl_minor,al; | |
ee60d9fb | 234 | int enc_err,n,i,ret= -1; |
d02b48c6 RE |
235 | SSL3_RECORD *rr; |
236 | SSL_SESSION *sess; | |
237 | unsigned char *p; | |
238 | unsigned char md[EVP_MAX_MD_SIZE]; | |
239 | short version; | |
240 | unsigned int mac_size; | |
3def5a01 BM |
241 | int clear=0; |
242 | size_t extra; | |
5b0b0e98 RL |
243 | int decryption_failed_or_bad_record_mac = 0; |
244 | unsigned char *mac = NULL; | |
d02b48c6 RE |
245 | |
246 | rr= &(s->s3->rrec); | |
d02b48c6 RE |
247 | sess=s->session; |
248 | ||
58964a49 | 249 | if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER) |
d02b48c6 RE |
250 | extra=SSL3_RT_MAX_EXTRA; |
251 | else | |
252 | extra=0; | |
3def5a01 | 253 | if (extra != s->s3->rbuf.len - SSL3_RT_MAX_PACKET_SIZE) |
82b0bf0b BM |
254 | { |
255 | /* actually likely an application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER | |
256 | * set after ssl3_setup_buffers() was done */ | |
257 | SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR); | |
258 | return -1; | |
259 | } | |
d02b48c6 RE |
260 | |
261 | again: | |
262 | /* check if we have the header */ | |
263 | if ( (s->rstate != SSL_ST_READ_BODY) || | |
264 | (s->packet_length < SSL3_RT_HEADER_LENGTH)) | |
265 | { | |
82b0bf0b | 266 | n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0); |
d02b48c6 RE |
267 | if (n <= 0) return(n); /* error or non-blocking */ |
268 | s->rstate=SSL_ST_READ_BODY; | |
269 | ||
270 | p=s->packet; | |
271 | ||
272 | /* Pull apart the header into the SSL3_RECORD */ | |
273 | rr->type= *(p++); | |
274 | ssl_major= *(p++); | |
275 | ssl_minor= *(p++); | |
276 | version=(ssl_major<<8)|ssl_minor; | |
277 | n2s(p,rr->length); | |
278 | ||
279 | /* Lets check version */ | |
5c6f76da | 280 | if (!s->first_packet) |
d02b48c6 | 281 | { |
58964a49 RE |
282 | if (version != s->version) |
283 | { | |
284 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER); | |
285 | /* Send back error using their | |
286 | * version number :-) */ | |
287 | s->version=version; | |
288 | al=SSL_AD_PROTOCOL_VERSION; | |
289 | goto f_err; | |
290 | } | |
d02b48c6 RE |
291 | } |
292 | ||
58964a49 | 293 | if ((version>>8) != SSL3_VERSION_MAJOR) |
d02b48c6 | 294 | { |
58964a49 | 295 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER); |
d02b48c6 RE |
296 | goto err; |
297 | } | |
298 | ||
3def5a01 | 299 | if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra) |
d02b48c6 | 300 | { |
58964a49 | 301 | al=SSL_AD_RECORD_OVERFLOW; |
d02b48c6 RE |
302 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG); |
303 | goto f_err; | |
304 | } | |
305 | ||
52732b38 | 306 | /* now s->rstate == SSL_ST_READ_BODY */ |
d02b48c6 RE |
307 | } |
308 | ||
52732b38 BM |
309 | /* s->rstate == SSL_ST_READ_BODY, get and decode the data */ |
310 | ||
3def5a01 | 311 | if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH) |
d02b48c6 | 312 | { |
52732b38 BM |
313 | /* now s->packet_length == SSL3_RT_HEADER_LENGTH */ |
314 | i=rr->length; | |
315 | n=ssl3_read_n(s,i,i,1); | |
316 | if (n <= 0) return(n); /* error or non-blocking io */ | |
317 | /* now n == rr->length, | |
318 | * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */ | |
d02b48c6 RE |
319 | } |
320 | ||
52732b38 | 321 | s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */ |
d02b48c6 | 322 | |
52732b38 BM |
323 | /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length, |
324 | * and we have that many bytes in s->packet | |
325 | */ | |
d02b48c6 RE |
326 | rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]); |
327 | ||
328 | /* ok, we can now read from 's->packet' data into 'rr' | |
329 | * rr->input points at rr->length bytes, which | |
330 | * need to be copied into rr->data by either | |
331 | * the decryption or by the decompression | |
332 | * When the data is 'copied' into the rr->data buffer, | |
333 | * rr->input will be pointed at the new buffer */ | |
334 | ||
d02b48c6 RE |
335 | /* We now have - encrypted [ MAC [ compressed [ plain ] ] ] |
336 | * rr->length bytes of encrypted compressed stuff. */ | |
337 | ||
657e60fa | 338 | /* check is not needed I believe */ |
3def5a01 | 339 | if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra) |
d02b48c6 | 340 | { |
58964a49 | 341 | al=SSL_AD_RECORD_OVERFLOW; |
d02b48c6 RE |
342 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG); |
343 | goto f_err; | |
344 | } | |
345 | ||
346 | /* decrypt in place in 'rr->input' */ | |
347 | rr->data=rr->input; | |
348 | ||
ee60d9fb BM |
349 | enc_err = s->method->ssl3_enc->enc(s,0); |
350 | if (enc_err <= 0) | |
d02b48c6 | 351 | { |
ee60d9fb BM |
352 | if (enc_err == 0) |
353 | /* SSLerr() and ssl3_send_alert() have been called */ | |
354 | goto err; | |
355 | ||
5b0b0e98 RL |
356 | /* Otherwise enc_err == -1, which indicates bad padding |
357 | * (rec->length has not been changed in this case). | |
358 | * To minimize information leaked via timing, we will perform | |
359 | * the MAC computation anyway. */ | |
360 | decryption_failed_or_bad_record_mac = 1; | |
d02b48c6 | 361 | } |
ee60d9fb | 362 | |
58964a49 RE |
363 | #ifdef TLS_DEBUG |
364 | printf("dec %d\n",rr->length); | |
dfeab068 | 365 | { unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); } |
58964a49 RE |
366 | printf("\n"); |
367 | #endif | |
ee60d9fb | 368 | |
d02b48c6 RE |
369 | /* r->length is now the compressed data plus mac */ |
370 | if ( (sess == NULL) || | |
371 | (s->enc_read_ctx == NULL) || | |
372 | (s->read_hash == NULL)) | |
373 | clear=1; | |
374 | ||
375 | if (!clear) | |
376 | { | |
377 | mac_size=EVP_MD_size(s->read_hash); | |
378 | ||
379 | if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size) | |
380 | { | |
ee60d9fb | 381 | #if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */ |
58964a49 | 382 | al=SSL_AD_RECORD_OVERFLOW; |
d02b48c6 RE |
383 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG); |
384 | goto f_err; | |
ee60d9fb | 385 | #else |
5b0b0e98 | 386 | decryption_failed_or_bad_record_mac = 1; |
ee60d9fb | 387 | #endif |
d02b48c6 | 388 | } |
52732b38 | 389 | /* check the MAC for rr->input (it's in mac_size bytes at the tail) */ |
5b0b0e98 | 390 | if (rr->length >= mac_size) |
d02b48c6 | 391 | { |
5b0b0e98 RL |
392 | rr->length -= mac_size; |
393 | mac = &rr->data[rr->length]; | |
394 | } | |
395 | else | |
396 | { | |
397 | /* record (minus padding) is too short to contain a MAC */ | |
ee60d9fb | 398 | #if 0 /* OK only for stream ciphers */ |
58964a49 | 399 | al=SSL_AD_DECODE_ERROR; |
d02b48c6 RE |
400 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT); |
401 | goto f_err; | |
ee60d9fb | 402 | #else |
5b0b0e98 RL |
403 | decryption_failed_or_bad_record_mac = 1; |
404 | rr->length = 0; | |
ee60d9fb | 405 | #endif |
d02b48c6 | 406 | } |
58964a49 | 407 | i=s->method->ssl3_enc->mac(s,md,0); |
5b0b0e98 | 408 | if (mac == NULL || memcmp(md, mac, mac_size) != 0) |
d02b48c6 | 409 | { |
5b0b0e98 | 410 | decryption_failed_or_bad_record_mac = 1; |
d02b48c6 RE |
411 | } |
412 | } | |
413 | ||
5b0b0e98 RL |
414 | if (decryption_failed_or_bad_record_mac) |
415 | { | |
416 | /* A separate 'decryption_failed' alert was introduced with TLS 1.0, | |
417 | * SSL 3.0 only has 'bad_record_mac'. But unless a decryption | |
418 | * failure is directly visible from the ciphertext anyway, | |
419 | * we should not reveal which kind of error occured -- this | |
420 | * might become visible to an attacker (e.g. via a logfile) */ | |
421 | al=SSL_AD_BAD_RECORD_MAC; | |
422 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC); | |
423 | goto f_err; | |
424 | } | |
425 | ||
d02b48c6 | 426 | /* r->length is now just compressed */ |
dfeab068 | 427 | if (s->expand != NULL) |
d02b48c6 | 428 | { |
3def5a01 | 429 | if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra) |
d02b48c6 | 430 | { |
58964a49 | 431 | al=SSL_AD_RECORD_OVERFLOW; |
d02b48c6 RE |
432 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG); |
433 | goto f_err; | |
434 | } | |
36d16f8e | 435 | if (!ssl3_do_uncompress(s)) |
d02b48c6 | 436 | { |
58964a49 | 437 | al=SSL_AD_DECOMPRESSION_FAILURE; |
d02b48c6 RE |
438 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION); |
439 | goto f_err; | |
440 | } | |
441 | } | |
442 | ||
3def5a01 | 443 | if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra) |
d02b48c6 | 444 | { |
58964a49 | 445 | al=SSL_AD_RECORD_OVERFLOW; |
d02b48c6 RE |
446 | SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG); |
447 | goto f_err; | |
448 | } | |
449 | ||
450 | rr->off=0; | |
451 | /* So at this point the following is true | |
452 | * ssl->s3->rrec.type is the type of record | |
453 | * ssl->s3->rrec.length == number of bytes in record | |
454 | * ssl->s3->rrec.off == offset to first valid byte | |
455 | * ssl->s3->rrec.data == where to take bytes from, increment | |
456 | * after use :-). | |
457 | */ | |
458 | ||
459 | /* we have pulled in a full packet so zero things */ | |
460 | s->packet_length=0; | |
461 | ||
462 | /* just read a 0 length packet */ | |
463 | if (rr->length == 0) goto again; | |
464 | ||
465 | return(1); | |
ee60d9fb | 466 | |
d02b48c6 RE |
467 | f_err: |
468 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
469 | err: | |
470 | return(ret); | |
471 | } | |
472 | ||
36d16f8e | 473 | int ssl3_do_uncompress(SSL *ssl) |
d02b48c6 | 474 | { |
54f51116 | 475 | #ifndef OPENSSL_NO_COMP |
dfeab068 RE |
476 | int i; |
477 | SSL3_RECORD *rr; | |
478 | ||
479 | rr= &(ssl->s3->rrec); | |
480 | i=COMP_expand_block(ssl->expand,rr->comp, | |
481 | SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length); | |
482 | if (i < 0) | |
483 | return(0); | |
484 | else | |
485 | rr->length=i; | |
486 | rr->data=rr->comp; | |
54f51116 | 487 | #endif |
d02b48c6 RE |
488 | return(1); |
489 | } | |
490 | ||
36d16f8e | 491 | int ssl3_do_compress(SSL *ssl) |
d02b48c6 | 492 | { |
54f51116 | 493 | #ifndef OPENSSL_NO_COMP |
dfeab068 RE |
494 | int i; |
495 | SSL3_RECORD *wr; | |
496 | ||
497 | wr= &(ssl->s3->wrec); | |
498 | i=COMP_compress_block(ssl->compress,wr->data, | |
499 | SSL3_RT_MAX_COMPRESSED_LENGTH, | |
500 | wr->input,(int)wr->length); | |
501 | if (i < 0) | |
502 | return(0); | |
503 | else | |
504 | wr->length=i; | |
505 | ||
506 | wr->input=wr->data; | |
54f51116 | 507 | #endif |
d02b48c6 RE |
508 | return(1); |
509 | } | |
510 | ||
52732b38 | 511 | /* Call this to write data in records of type 'type' |
d02b48c6 RE |
512 | * It will return <= 0 if not all data has been sent or non-blocking IO. |
513 | */ | |
52732b38 | 514 | int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len) |
d02b48c6 | 515 | { |
52732b38 | 516 | const unsigned char *buf=buf_; |
d02b48c6 RE |
517 | unsigned int tot,n,nw; |
518 | int i; | |
519 | ||
520 | s->rwstate=SSL_NOTHING; | |
521 | tot=s->s3->wnum; | |
522 | s->s3->wnum=0; | |
523 | ||
524 | if (SSL_in_init(s) && !s->in_handshake) | |
525 | { | |
526 | i=s->handshake_func(s); | |
527 | if (i < 0) return(i); | |
528 | if (i == 0) | |
529 | { | |
530 | SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); | |
82b0bf0b | 531 | return -1; |
d02b48c6 RE |
532 | } |
533 | } | |
534 | ||
535 | n=(len-tot); | |
536 | for (;;) | |
537 | { | |
538 | if (n > SSL3_RT_MAX_PLAIN_LENGTH) | |
539 | nw=SSL3_RT_MAX_PLAIN_LENGTH; | |
540 | else | |
541 | nw=n; | |
b35e9050 | 542 | |
82b0bf0b | 543 | i=do_ssl3_write(s, type, &(buf[tot]), nw, 0); |
d02b48c6 RE |
544 | if (i <= 0) |
545 | { | |
546 | s->s3->wnum=tot; | |
82b0bf0b | 547 | return i; |
d02b48c6 RE |
548 | } |
549 | ||
e1056435 BM |
550 | if ((i == (int)n) || |
551 | (type == SSL3_RT_APPLICATION_DATA && | |
11b1adad | 552 | (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))) |
e1056435 | 553 | { |
82b0bf0b BM |
554 | /* next chunk of data should get another prepended empty fragment |
555 | * in ciphersuites with known-IV weakness: */ | |
556 | s->s3->empty_fragment_done = 0; | |
557 | ||
558 | return tot+i; | |
e1056435 | 559 | } |
d02b48c6 RE |
560 | |
561 | n-=i; | |
562 | tot+=i; | |
563 | } | |
564 | } | |
565 | ||
61f5b6f3 | 566 | static int do_ssl3_write(SSL *s, int type, const unsigned char *buf, |
82b0bf0b | 567 | unsigned int len, int create_empty_fragment) |
d02b48c6 RE |
568 | { |
569 | unsigned char *p,*plen; | |
570 | int i,mac_size,clear=0; | |
82b0bf0b | 571 | int prefix_len = 0; |
d02b48c6 RE |
572 | SSL3_RECORD *wr; |
573 | SSL3_BUFFER *wb; | |
574 | SSL_SESSION *sess; | |
575 | ||
82b0bf0b | 576 | /* first check if there is a SSL3_BUFFER still being written |
d02b48c6 RE |
577 | * out. This will happen with non blocking IO */ |
578 | if (s->s3->wbuf.left != 0) | |
579 | return(ssl3_write_pending(s,type,buf,len)); | |
580 | ||
581 | /* If we have an alert to send, lets send it */ | |
582 | if (s->s3->alert_dispatch) | |
583 | { | |
36d16f8e | 584 | i=s->method->ssl_dispatch_alert(s); |
d02b48c6 RE |
585 | if (i <= 0) |
586 | return(i); | |
587 | /* if it went, fall through and send more stuff */ | |
588 | } | |
589 | ||
82b0bf0b BM |
590 | if (len == 0 && !create_empty_fragment) |
591 | return 0; | |
b35e9050 | 592 | |
d02b48c6 RE |
593 | wr= &(s->s3->wrec); |
594 | wb= &(s->s3->wbuf); | |
595 | sess=s->session; | |
596 | ||
597 | if ( (sess == NULL) || | |
598 | (s->enc_write_ctx == NULL) || | |
599 | (s->write_hash == NULL)) | |
600 | clear=1; | |
601 | ||
602 | if (clear) | |
603 | mac_size=0; | |
604 | else | |
605 | mac_size=EVP_MD_size(s->write_hash); | |
606 | ||
82b0bf0b BM |
607 | /* 'create_empty_fragment' is true only when this function calls itself */ |
608 | if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done) | |
609 | { | |
610 | /* countermeasure against known-IV weakness in CBC ciphersuites | |
611 | * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ | |
612 | ||
613 | if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA) | |
614 | { | |
615 | /* recursive function call with 'create_empty_fragment' set; | |
616 | * this prepares and buffers the data for an empty fragment | |
617 | * (these 'prefix_len' bytes are sent out later | |
618 | * together with the actual payload) */ | |
619 | prefix_len = do_ssl3_write(s, type, buf, 0, 1); | |
620 | if (prefix_len <= 0) | |
621 | goto err; | |
622 | ||
b889d6a8 | 623 | if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE) |
82b0bf0b BM |
624 | { |
625 | /* insufficient space */ | |
626 | SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR); | |
627 | goto err; | |
628 | } | |
629 | } | |
630 | ||
631 | s->s3->empty_fragment_done = 1; | |
632 | } | |
633 | ||
634 | p = wb->buf + prefix_len; | |
d02b48c6 RE |
635 | |
636 | /* write the header */ | |
82b0bf0b | 637 | |
d02b48c6 RE |
638 | *(p++)=type&0xff; |
639 | wr->type=type; | |
640 | ||
58964a49 RE |
641 | *(p++)=(s->version>>8); |
642 | *(p++)=s->version&0xff; | |
b35e9050 | 643 | |
82b0bf0b | 644 | /* field where we are to write out packet length */ |
d02b48c6 RE |
645 | plen=p; |
646 | p+=2; | |
b35e9050 | 647 | |
d02b48c6 RE |
648 | /* lets setup the record stuff. */ |
649 | wr->data=p; | |
650 | wr->length=(int)len; | |
651 | wr->input=(unsigned char *)buf; | |
652 | ||
653 | /* we now 'read' from wr->input, wr->length bytes into | |
654 | * wr->data */ | |
655 | ||
656 | /* first we compress */ | |
dfeab068 | 657 | if (s->compress != NULL) |
d02b48c6 | 658 | { |
36d16f8e | 659 | if (!ssl3_do_compress(s)) |
d02b48c6 RE |
660 | { |
661 | SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE); | |
662 | goto err; | |
663 | } | |
664 | } | |
665 | else | |
666 | { | |
667 | memcpy(wr->data,wr->input,wr->length); | |
668 | wr->input=wr->data; | |
669 | } | |
670 | ||
671 | /* we should still have the output to wr->data and the input | |
672 | * from wr->input. Length should be wr->length. | |
673 | * wr->data still points in the wb->buf */ | |
674 | ||
675 | if (mac_size != 0) | |
676 | { | |
58964a49 | 677 | s->method->ssl3_enc->mac(s,&(p[wr->length]),1); |
d02b48c6 RE |
678 | wr->length+=mac_size; |
679 | wr->input=p; | |
680 | wr->data=p; | |
681 | } | |
682 | ||
683 | /* ssl3_enc can only have an error on read */ | |
58964a49 | 684 | s->method->ssl3_enc->enc(s,1); |
d02b48c6 RE |
685 | |
686 | /* record length after mac and block padding */ | |
687 | s2n(wr->length,plen); | |
688 | ||
689 | /* we should now have | |
690 | * wr->data pointing to the encrypted data, which is | |
691 | * wr->length long */ | |
692 | wr->type=type; /* not needed but helps for debugging */ | |
693 | wr->length+=SSL3_RT_HEADER_LENGTH; | |
694 | ||
82b0bf0b BM |
695 | if (create_empty_fragment) |
696 | { | |
697 | /* we are in a recursive call; | |
698 | * just return the length, don't write out anything here | |
699 | */ | |
700 | return wr->length; | |
701 | } | |
d02b48c6 | 702 | |
82b0bf0b BM |
703 | /* now let's set up wb */ |
704 | wb->left = prefix_len + wr->length; | |
705 | wb->offset = 0; | |
706 | ||
707 | /* memorize arguments so that ssl3_write_pending can detect bad write retries later */ | |
d02b48c6 RE |
708 | s->s3->wpend_tot=len; |
709 | s->s3->wpend_buf=buf; | |
710 | s->s3->wpend_type=type; | |
711 | s->s3->wpend_ret=len; | |
712 | ||
713 | /* we now just need to write the buffer */ | |
82b0bf0b | 714 | return ssl3_write_pending(s,type,buf,len); |
d02b48c6 | 715 | err: |
82b0bf0b | 716 | return -1; |
d02b48c6 RE |
717 | } |
718 | ||
719 | /* if s->s3->wbuf.left != 0, we need to call this */ | |
36d16f8e BL |
720 | int ssl3_write_pending(SSL *s, int type, const unsigned char *buf, |
721 | unsigned int len) | |
d02b48c6 RE |
722 | { |
723 | int i; | |
724 | ||
58964a49 | 725 | /* XXXX */ |
e1056435 BM |
726 | if ((s->s3->wpend_tot > (int)len) |
727 | || ((s->s3->wpend_buf != buf) && | |
1afd8b39 | 728 | !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)) |
d02b48c6 RE |
729 | || (s->s3->wpend_type != type)) |
730 | { | |
731 | SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY); | |
58964a49 | 732 | return(-1); |
d02b48c6 RE |
733 | } |
734 | ||
735 | for (;;) | |
736 | { | |
58964a49 | 737 | clear_sys_error(); |
d02b48c6 RE |
738 | if (s->wbio != NULL) |
739 | { | |
740 | s->rwstate=SSL_WRITING; | |
741 | i=BIO_write(s->wbio, | |
742 | (char *)&(s->s3->wbuf.buf[s->s3->wbuf.offset]), | |
743 | (unsigned int)s->s3->wbuf.left); | |
744 | } | |
745 | else | |
746 | { | |
747 | SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET); | |
748 | i= -1; | |
749 | } | |
750 | if (i == s->s3->wbuf.left) | |
751 | { | |
752 | s->s3->wbuf.left=0; | |
753 | s->rwstate=SSL_NOTHING; | |
754 | return(s->s3->wpend_ret); | |
755 | } | |
ab073bad LJ |
756 | else if (i <= 0) { |
757 | if (s->version == DTLS1_VERSION || | |
758 | s->version == DTLS1_BAD_VER) { | |
759 | /* For DTLS, just drop it. That's kind of the whole | |
760 | point in using a datagram service */ | |
761 | s->s3->wbuf.left = 0; | |
762 | } | |
d02b48c6 | 763 | return(i); |
ab073bad | 764 | } |
d02b48c6 RE |
765 | s->s3->wbuf.offset+=i; |
766 | s->s3->wbuf.left-=i; | |
767 | } | |
768 | } | |
769 | ||
b35e9050 BM |
770 | /* Return up to 'len' payload bytes received in 'type' records. |
771 | * 'type' is one of the following: | |
772 | * | |
773 | * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) | |
774 | * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) | |
775 | * - 0 (during a shutdown, no data has to be returned) | |
776 | * | |
777 | * If we don't have stored data to work from, read a SSL/TLS record first | |
778 | * (possibly multiple records if we still don't have anything to return). | |
779 | * | |
780 | * This function must handle any surprises the peer may have for us, such as | |
781 | * Alert records (e.g. close_notify), ChangeCipherSpec records (not really | |
782 | * a surprise, but handled as if it were), or renegotiation requests. | |
783 | * Also if record payloads contain fragments too small to process, we store | |
784 | * them until there is enough for the respective protocol (the record protocol | |
785 | * may use arbitrary fragmentation and even interleaving): | |
786 | * Change cipher spec protocol | |
787 | * just 1 byte needed, no need for keeping anything stored | |
788 | * Alert protocol | |
789 | * 2 bytes needed (AlertLevel, AlertDescription) | |
790 | * Handshake protocol | |
791 | * 4 bytes needed (HandshakeType, uint24 length) -- we just have | |
792 | * to detect unexpected Client Hello and Hello Request messages | |
793 | * here, anything else is handled by higher layers | |
794 | * Application data protocol | |
795 | * none of our business | |
796 | */ | |
5a4fbc69 | 797 | int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek) |
d02b48c6 | 798 | { |
b08b07b8 BM |
799 | int al,i,j,ret; |
800 | unsigned int n; | |
d02b48c6 | 801 | SSL3_RECORD *rr; |
45d87a1f | 802 | void (*cb)(const SSL *ssl,int type2,int val)=NULL; |
d02b48c6 | 803 | |
c51ae173 | 804 | if (s->s3->rbuf.buf == NULL) /* Not initialized yet */ |
d02b48c6 RE |
805 | if (!ssl3_setup_buffers(s)) |
806 | return(-1); | |
807 | ||
a0aae68c BM |
808 | if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) || |
809 | (peek && (type != SSL3_RT_APPLICATION_DATA))) | |
b35e9050 | 810 | { |
5277d7cb | 811 | SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR); |
b35e9050 BM |
812 | return -1; |
813 | } | |
814 | ||
815 | if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0)) | |
816 | /* (partially) satisfy request from storage */ | |
817 | { | |
818 | unsigned char *src = s->s3->handshake_fragment; | |
819 | unsigned char *dst = buf; | |
8ab59e7a | 820 | unsigned int k; |
b35e9050 | 821 | |
a0aae68c | 822 | /* peek == 0 */ |
b35e9050 BM |
823 | n = 0; |
824 | while ((len > 0) && (s->s3->handshake_fragment_len > 0)) | |
825 | { | |
826 | *dst++ = *src++; | |
827 | len--; s->s3->handshake_fragment_len--; | |
828 | n++; | |
829 | } | |
830 | /* move any remaining fragment bytes: */ | |
8ab59e7a DSH |
831 | for (k = 0; k < s->s3->handshake_fragment_len; k++) |
832 | s->s3->handshake_fragment[k] = *src++; | |
b35e9050 BM |
833 | return n; |
834 | } | |
835 | ||
836 | /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */ | |
837 | ||
58964a49 | 838 | if (!s->in_handshake && SSL_in_init(s)) |
d02b48c6 | 839 | { |
b35e9050 | 840 | /* type == SSL3_RT_APPLICATION_DATA */ |
d02b48c6 RE |
841 | i=s->handshake_func(s); |
842 | if (i < 0) return(i); | |
843 | if (i == 0) | |
844 | { | |
845 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); | |
846 | return(-1); | |
847 | } | |
848 | } | |
849 | start: | |
850 | s->rwstate=SSL_NOTHING; | |
851 | ||
c51ae173 BM |
852 | /* s->s3->rrec.type - is the type of record |
853 | * s->s3->rrec.data, - data | |
854 | * s->s3->rrec.off, - offset into 'data' for next read | |
855 | * s->s3->rrec.length, - number of bytes. */ | |
b35e9050 | 856 | rr = &(s->s3->rrec); |
d02b48c6 | 857 | |
a0aae68c | 858 | /* get new packet if necessary */ |
d02b48c6 RE |
859 | if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY)) |
860 | { | |
861 | ret=ssl3_get_record(s); | |
862 | if (ret <= 0) return(ret); | |
863 | } | |
864 | ||
865 | /* we now have a packet which can be read and processed */ | |
866 | ||
b35e9050 BM |
867 | if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec, |
868 | * reset by ssl3_get_finished */ | |
869 | && (rr->type != SSL3_RT_HANDSHAKE)) | |
d02b48c6 | 870 | { |
58964a49 | 871 | al=SSL_AD_UNEXPECTED_MESSAGE; |
d02b48c6 | 872 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED); |
4843acc8 | 873 | goto f_err; |
d02b48c6 RE |
874 | } |
875 | ||
a0aae68c BM |
876 | /* If the other end has shut down, throw anything we read away |
877 | * (even in 'peek' mode) */ | |
d02b48c6 RE |
878 | if (s->shutdown & SSL_RECEIVED_SHUTDOWN) |
879 | { | |
880 | rr->length=0; | |
881 | s->rwstate=SSL_NOTHING; | |
882 | return(0); | |
883 | } | |
884 | ||
b35e9050 BM |
885 | |
886 | if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */ | |
887 | { | |
888 | /* make sure that we are not getting application data when we | |
889 | * are doing a handshake for the first time */ | |
890 | if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && | |
891 | (s->enc_read_ctx == NULL)) | |
892 | { | |
893 | al=SSL_AD_UNEXPECTED_MESSAGE; | |
894 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE); | |
895 | goto f_err; | |
896 | } | |
897 | ||
898 | if (len <= 0) return(len); | |
899 | ||
900 | if ((unsigned int)len > rr->length) | |
e5599db4 | 901 | n = rr->length; |
b35e9050 | 902 | else |
e5599db4 | 903 | n = (unsigned int)len; |
b35e9050 | 904 | |
e5599db4 | 905 | memcpy(buf,&(rr->data[rr->off]),n); |
a0aae68c | 906 | if (!peek) |
b35e9050 | 907 | { |
a0aae68c BM |
908 | rr->length-=n; |
909 | rr->off+=n; | |
910 | if (rr->length == 0) | |
911 | { | |
912 | s->rstate=SSL_ST_READ_HEADER; | |
913 | rr->off=0; | |
914 | } | |
b35e9050 | 915 | } |
b35e9050 BM |
916 | return(n); |
917 | } | |
918 | ||
919 | ||
920 | /* If we get here, then type != rr->type; if we have a handshake | |
921 | * message, then it was unexpected (Hello Request or Client Hello). */ | |
922 | ||
923 | /* In case of record types for which we have 'fragment' storage, | |
924 | * fill that so that we can process the data at a fixed place. | |
925 | */ | |
926 | { | |
e5599db4 | 927 | unsigned int dest_maxlen = 0; |
72b60351 | 928 | unsigned char *dest = NULL; |
e5599db4 | 929 | unsigned int *dest_len = NULL; |
b35e9050 BM |
930 | |
931 | if (rr->type == SSL3_RT_HANDSHAKE) | |
932 | { | |
933 | dest_maxlen = sizeof s->s3->handshake_fragment; | |
934 | dest = s->s3->handshake_fragment; | |
935 | dest_len = &s->s3->handshake_fragment_len; | |
936 | } | |
937 | else if (rr->type == SSL3_RT_ALERT) | |
938 | { | |
939 | dest_maxlen = sizeof s->s3->alert_fragment; | |
940 | dest = s->s3->alert_fragment; | |
941 | dest_len = &s->s3->alert_fragment_len; | |
942 | } | |
943 | ||
944 | if (dest_maxlen > 0) | |
945 | { | |
946 | n = dest_maxlen - *dest_len; /* available space in 'dest' */ | |
e5599db4 | 947 | if (rr->length < n) |
b35e9050 BM |
948 | n = rr->length; /* available bytes */ |
949 | ||
950 | /* now move 'n' bytes: */ | |
951 | while (n-- > 0) | |
952 | { | |
953 | dest[(*dest_len)++] = rr->data[rr->off++]; | |
954 | rr->length--; | |
955 | } | |
956 | ||
957 | if (*dest_len < dest_maxlen) | |
958 | goto start; /* fragment was too small */ | |
959 | } | |
960 | } | |
961 | ||
962 | /* s->s3->handshake_fragment_len == 4 iff rr->type == SSL3_RT_HANDSHAKE; | |
963 | * s->s3->alert_fragment_len == 2 iff rr->type == SSL3_RT_ALERT. | |
964 | * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */ | |
965 | ||
966 | /* If we are a client, check for an incoming 'Hello Request': */ | |
967 | if ((!s->server) && | |
968 | (s->s3->handshake_fragment_len >= 4) && | |
969 | (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) && | |
d02b48c6 RE |
970 | (s->session != NULL) && (s->session->cipher != NULL)) |
971 | { | |
b35e9050 BM |
972 | s->s3->handshake_fragment_len = 0; |
973 | ||
974 | if ((s->s3->handshake_fragment[1] != 0) || | |
975 | (s->s3->handshake_fragment[2] != 0) || | |
976 | (s->s3->handshake_fragment[3] != 0)) | |
d02b48c6 | 977 | { |
58964a49 | 978 | al=SSL_AD_DECODE_ERROR; |
c51ae173 | 979 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST); |
4843acc8 | 980 | goto f_err; |
d02b48c6 RE |
981 | } |
982 | ||
a661b653 BM |
983 | if (s->msg_callback) |
984 | s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg); | |
985 | ||
d02b48c6 | 986 | if (SSL_is_init_finished(s) && |
58964a49 RE |
987 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) && |
988 | !s->s3->renegotiate) | |
d02b48c6 RE |
989 | { |
990 | ssl3_renegotiate(s); | |
58964a49 | 991 | if (ssl3_renegotiate_check(s)) |
d02b48c6 | 992 | { |
b08b07b8 BM |
993 | i=s->handshake_func(s); |
994 | if (i < 0) return(i); | |
995 | if (i == 0) | |
58964a49 RE |
996 | { |
997 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); | |
998 | return(-1); | |
999 | } | |
1b8a8088 | 1000 | |
54f10e6a | 1001 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) |
1b8a8088 | 1002 | { |
54f10e6a BM |
1003 | if (s->s3->rbuf.left == 0) /* no read-ahead left? */ |
1004 | { | |
1005 | BIO *bio; | |
1006 | /* In the case where we try to read application data, | |
1007 | * but we trigger an SSL handshake, we return -1 with | |
1008 | * the retry option set. Otherwise renegotiation may | |
1009 | * cause nasty problems in the blocking world */ | |
1010 | s->rwstate=SSL_READING; | |
1011 | bio=SSL_get_rbio(s); | |
1012 | BIO_clear_retry_flags(bio); | |
1013 | BIO_set_retry_read(bio); | |
1014 | return(-1); | |
1015 | } | |
1b8a8088 | 1016 | } |
d02b48c6 RE |
1017 | } |
1018 | } | |
b35e9050 BM |
1019 | /* we either finished a handshake or ignored the request, |
1020 | * now try again to obtain the (application) data we were asked for */ | |
1021 | goto start; | |
d02b48c6 RE |
1022 | } |
1023 | ||
b35e9050 | 1024 | if (s->s3->alert_fragment_len >= 2) |
d02b48c6 | 1025 | { |
e5599db4 BM |
1026 | int alert_level = s->s3->alert_fragment[0]; |
1027 | int alert_descr = s->s3->alert_fragment[1]; | |
d02b48c6 | 1028 | |
b35e9050 | 1029 | s->s3->alert_fragment_len = 0; |
d02b48c6 | 1030 | |
a661b653 BM |
1031 | if (s->msg_callback) |
1032 | s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg); | |
1033 | ||
b35e9050 BM |
1034 | if (s->info_callback != NULL) |
1035 | cb=s->info_callback; | |
1036 | else if (s->ctx->info_callback != NULL) | |
1037 | cb=s->ctx->info_callback; | |
d02b48c6 | 1038 | |
b35e9050 BM |
1039 | if (cb != NULL) |
1040 | { | |
e5599db4 BM |
1041 | j = (alert_level << 8) | alert_descr; |
1042 | cb(s, SSL_CB_READ_ALERT, j); | |
b35e9050 | 1043 | } |
d02b48c6 | 1044 | |
e5599db4 | 1045 | if (alert_level == 1) /* warning */ |
b35e9050 | 1046 | { |
e5599db4 BM |
1047 | s->s3->warn_alert = alert_descr; |
1048 | if (alert_descr == SSL_AD_CLOSE_NOTIFY) | |
d02b48c6 | 1049 | { |
e5599db4 | 1050 | s->shutdown |= SSL_RECEIVED_SHUTDOWN; |
d02b48c6 RE |
1051 | return(0); |
1052 | } | |
d02b48c6 | 1053 | } |
e5599db4 | 1054 | else if (alert_level == 2) /* fatal */ |
d02b48c6 | 1055 | { |
b35e9050 BM |
1056 | char tmp[16]; |
1057 | ||
d02b48c6 | 1058 | s->rwstate=SSL_NOTHING; |
e5599db4 BM |
1059 | s->s3->fatal_alert = alert_descr; |
1060 | SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr); | |
c129544f | 1061 | BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr); |
b35e9050 BM |
1062 | ERR_add_error_data(2,"SSL alert number ",tmp); |
1063 | s->shutdown|=SSL_RECEIVED_SHUTDOWN; | |
1064 | SSL_CTX_remove_session(s->ctx,s->session); | |
d02b48c6 RE |
1065 | return(0); |
1066 | } | |
b35e9050 | 1067 | else |
d02b48c6 | 1068 | { |
b35e9050 BM |
1069 | al=SSL_AD_ILLEGAL_PARAMETER; |
1070 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE); | |
1071 | goto f_err; | |
d02b48c6 RE |
1072 | } |
1073 | ||
b35e9050 BM |
1074 | goto start; |
1075 | } | |
1076 | ||
1077 | if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */ | |
1078 | { | |
1079 | s->rwstate=SSL_NOTHING; | |
1080 | rr->length=0; | |
1081 | return(0); | |
1082 | } | |
1083 | ||
1084 | if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) | |
1085 | { | |
1086 | /* 'Change Cipher Spec' is just a single byte, so we know | |
1087 | * exactly what the record payload has to look like */ | |
1088 | if ( (rr->length != 1) || (rr->off != 0) || | |
1089 | (rr->data[0] != SSL3_MT_CCS)) | |
d02b48c6 | 1090 | { |
4843acc8 | 1091 | al=SSL_AD_ILLEGAL_PARAMETER; |
b35e9050 | 1092 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC); |
4843acc8 | 1093 | goto f_err; |
b35e9050 | 1094 | } |
58964a49 | 1095 | |
9e5790ce NL |
1096 | /* Check we have a cipher to change to */ |
1097 | if (s->s3->tmp.new_cipher == NULL) | |
1098 | { | |
1099 | al=SSL_AD_UNEXPECTED_MESSAGE; | |
fbeaa3c4 | 1100 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY); |
9e5790ce NL |
1101 | goto f_err; |
1102 | } | |
1103 | ||
b35e9050 | 1104 | rr->length=0; |
a661b653 BM |
1105 | |
1106 | if (s->msg_callback) | |
1107 | s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg); | |
1108 | ||
b35e9050 | 1109 | s->s3->change_cipher_spec=1; |
36d16f8e | 1110 | if (!ssl3_do_change_cipher_spec(s)) |
b35e9050 BM |
1111 | goto err; |
1112 | else | |
1113 | goto start; | |
1114 | } | |
58964a49 | 1115 | |
b35e9050 BM |
1116 | /* Unexpected handshake message (Client Hello, or protocol violation) */ |
1117 | if ((s->s3->handshake_fragment_len >= 4) && !s->in_handshake) | |
1118 | { | |
1119 | if (((s->state&SSL_ST_MASK) == SSL_ST_OK) && | |
1120 | !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) | |
1121 | { | |
a2a01589 BM |
1122 | #if 0 /* worked only because C operator preferences are not as expected (and |
1123 | * because this is not really needed for clients except for detecting | |
1124 | * protocol violations): */ | |
b35e9050 BM |
1125 | s->state=SSL_ST_BEFORE|(s->server) |
1126 | ?SSL_ST_ACCEPT | |
1127 | :SSL_ST_CONNECT; | |
a2a01589 BM |
1128 | #else |
1129 | s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT; | |
1130 | #endif | |
b35e9050 BM |
1131 | s->new_session=1; |
1132 | } | |
e5599db4 BM |
1133 | i=s->handshake_func(s); |
1134 | if (i < 0) return(i); | |
1135 | if (i == 0) | |
b35e9050 BM |
1136 | { |
1137 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE); | |
58964a49 | 1138 | return(-1); |
d02b48c6 RE |
1139 | } |
1140 | ||
54f10e6a | 1141 | if (!(s->mode & SSL_MODE_AUTO_RETRY)) |
1b8a8088 | 1142 | { |
54f10e6a BM |
1143 | if (s->s3->rbuf.left == 0) /* no read-ahead left? */ |
1144 | { | |
1145 | BIO *bio; | |
1146 | /* In the case where we try to read application data, | |
1147 | * but we trigger an SSL handshake, we return -1 with | |
1148 | * the retry option set. Otherwise renegotiation may | |
1149 | * cause nasty problems in the blocking world */ | |
1150 | s->rwstate=SSL_READING; | |
1151 | bio=SSL_get_rbio(s); | |
1152 | BIO_clear_retry_flags(bio); | |
1153 | BIO_set_retry_read(bio); | |
1154 | return(-1); | |
1155 | } | |
1b8a8088 | 1156 | } |
a2a01589 | 1157 | goto start; |
a2a01589 | 1158 | } |
b35e9050 BM |
1159 | |
1160 | switch (rr->type) | |
1161 | { | |
1162 | default: | |
bc36ee62 | 1163 | #ifndef OPENSSL_NO_TLS |
b35e9050 BM |
1164 | /* TLS just ignores unknown message types */ |
1165 | if (s->version == TLS1_VERSION) | |
1166 | { | |
dcbbf83d | 1167 | rr->length = 0; |
b35e9050 BM |
1168 | goto start; |
1169 | } | |
58964a49 | 1170 | #endif |
b35e9050 BM |
1171 | al=SSL_AD_UNEXPECTED_MESSAGE; |
1172 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD); | |
1173 | goto f_err; | |
1174 | case SSL3_RT_CHANGE_CIPHER_SPEC: | |
1175 | case SSL3_RT_ALERT: | |
1176 | case SSL3_RT_HANDSHAKE: | |
1177 | /* we already handled all of these, with the possible exception | |
1178 | * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that | |
1179 | * should not happen when type != rr->type */ | |
1180 | al=SSL_AD_UNEXPECTED_MESSAGE; | |
5277d7cb | 1181 | SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR); |
b35e9050 BM |
1182 | goto f_err; |
1183 | case SSL3_RT_APPLICATION_DATA: | |
1184 | /* At this point, we were expecting handshake data, | |
1185 | * but have application data. If the library was | |
1186 | * running inside ssl3_read() (i.e. in_read_app_data | |
1187 | * is set) and it makes sense to read application data | |
a2a01589 | 1188 | * at this point (session renegotiation not yet started), |
b35e9050 BM |
1189 | * we will indulge it. |
1190 | */ | |
1191 | if (s->s3->in_read_app_data && | |
1192 | (s->s3->total_renegotiations != 0) && | |
1193 | (( | |
1194 | (s->state & SSL_ST_CONNECT) && | |
1195 | (s->state >= SSL3_ST_CW_CLNT_HELLO_A) && | |
1196 | (s->state <= SSL3_ST_CR_SRVR_HELLO_A) | |
1197 | ) || ( | |
1198 | (s->state & SSL_ST_ACCEPT) && | |
1199 | (s->state <= SSL3_ST_SW_HELLO_REQ_A) && | |
1200 | (s->state >= SSL3_ST_SR_CLNT_HELLO_A) | |
1201 | ) | |
1202 | )) | |
1203 | { | |
82b0bf0b | 1204 | s->s3->in_read_app_data=2; |
b35e9050 BM |
1205 | return(-1); |
1206 | } | |
1207 | else | |
1208 | { | |
58964a49 RE |
1209 | al=SSL_AD_UNEXPECTED_MESSAGE; |
1210 | SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD); | |
1211 | goto f_err; | |
58964a49 | 1212 | } |
d02b48c6 | 1213 | } |
b35e9050 | 1214 | /* not reached */ |
d02b48c6 | 1215 | |
d02b48c6 RE |
1216 | f_err: |
1217 | ssl3_send_alert(s,SSL3_AL_FATAL,al); | |
1218 | err: | |
1219 | return(-1); | |
1220 | } | |
1221 | ||
36d16f8e | 1222 | int ssl3_do_change_cipher_spec(SSL *s) |
58964a49 RE |
1223 | { |
1224 | int i; | |
c44f7540 | 1225 | const char *sender; |
58964a49 RE |
1226 | int slen; |
1227 | ||
1228 | if (s->state & SSL_ST_ACCEPT) | |
1229 | i=SSL3_CHANGE_CIPHER_SERVER_READ; | |
1230 | else | |
1231 | i=SSL3_CHANGE_CIPHER_CLIENT_READ; | |
1232 | ||
1233 | if (s->s3->tmp.key_block == NULL) | |
1234 | { | |
f9f6f0e9 BM |
1235 | if (s->session == NULL) |
1236 | { | |
1237 | /* might happen if dtls1_read_bytes() calls this */ | |
1238 | SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC,SSL_R_CCS_RECEIVED_EARLY); | |
1239 | return (0); | |
1240 | } | |
1241 | ||
58964a49 RE |
1242 | s->session->cipher=s->s3->tmp.new_cipher; |
1243 | if (!s->method->ssl3_enc->setup_key_block(s)) return(0); | |
1244 | } | |
1245 | ||
1246 | if (!s->method->ssl3_enc->change_cipher_state(s,i)) | |
1247 | return(0); | |
1248 | ||
1249 | /* we have to record the message digest at | |
1250 | * this point so we can get it before we read | |
1251 | * the finished message */ | |
1252 | if (s->state & SSL_ST_CONNECT) | |
1253 | { | |
c44f7540 BM |
1254 | sender=s->method->ssl3_enc->server_finished_label; |
1255 | slen=s->method->ssl3_enc->server_finished_label_len; | |
58964a49 RE |
1256 | } |
1257 | else | |
1258 | { | |
c44f7540 BM |
1259 | sender=s->method->ssl3_enc->client_finished_label; |
1260 | slen=s->method->ssl3_enc->client_finished_label_len; | |
58964a49 RE |
1261 | } |
1262 | ||
9fb617e2 | 1263 | s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s, |
58964a49 RE |
1264 | &(s->s3->finish_dgst1), |
1265 | &(s->s3->finish_dgst2), | |
9fb617e2 | 1266 | sender,slen,s->s3->tmp.peer_finish_md); |
58964a49 RE |
1267 | |
1268 | return(1); | |
1269 | } | |
1270 | ||
6b691a5c | 1271 | void ssl3_send_alert(SSL *s, int level, int desc) |
d02b48c6 | 1272 | { |
58964a49 RE |
1273 | /* Map tls/ssl alert value to correct one */ |
1274 | desc=s->method->ssl3_enc->alert_value(desc); | |
a661b653 BM |
1275 | if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION) |
1276 | desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */ | |
58964a49 | 1277 | if (desc < 0) return; |
d02b48c6 RE |
1278 | /* If a fatal one, remove from cache */ |
1279 | if ((level == 2) && (s->session != NULL)) | |
1280 | SSL_CTX_remove_session(s->ctx,s->session); | |
1281 | ||
1282 | s->s3->alert_dispatch=1; | |
1283 | s->s3->send_alert[0]=level; | |
1284 | s->s3->send_alert[1]=desc; | |
ee60d9fb | 1285 | if (s->s3->wbuf.left == 0) /* data still being written out? */ |
36d16f8e | 1286 | s->method->ssl_dispatch_alert(s); |
d02b48c6 RE |
1287 | /* else data is still being written out, we will get written |
1288 | * some time in the future */ | |
1289 | } | |
1290 | ||
6b691a5c | 1291 | int ssl3_dispatch_alert(SSL *s) |
d02b48c6 RE |
1292 | { |
1293 | int i,j; | |
45d87a1f | 1294 | void (*cb)(const SSL *ssl,int type,int val)=NULL; |
d02b48c6 RE |
1295 | |
1296 | s->s3->alert_dispatch=0; | |
82b0bf0b | 1297 | i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0); |
d02b48c6 RE |
1298 | if (i <= 0) |
1299 | { | |
1300 | s->s3->alert_dispatch=1; | |
1301 | } | |
1302 | else | |
1303 | { | |
ee60d9fb BM |
1304 | /* Alert sent to BIO. If it is important, flush it now. |
1305 | * If the message does not get sent due to non-blocking IO, | |
1306 | * we will not worry too much. */ | |
d02b48c6 | 1307 | if (s->s3->send_alert[0] == SSL3_AL_FATAL) |
d58d092b | 1308 | (void)BIO_flush(s->wbio); |
d02b48c6 | 1309 | |
a661b653 BM |
1310 | if (s->msg_callback) |
1311 | s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg); | |
1312 | ||
d02b48c6 RE |
1313 | if (s->info_callback != NULL) |
1314 | cb=s->info_callback; | |
1315 | else if (s->ctx->info_callback != NULL) | |
1316 | cb=s->ctx->info_callback; | |
b35e9050 | 1317 | |
d02b48c6 RE |
1318 | if (cb != NULL) |
1319 | { | |
1320 | j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1]; | |
1321 | cb(s,SSL_CB_WRITE_ALERT,j); | |
1322 | } | |
1323 | } | |
1324 | return(i); | |
1325 | } |